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Math Help - vague concept on potential

  1. #1
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    vague concept on potential

    Hi ,
    i have a question I dont know how to answer:

    Explain why the potential integral formula cannot be used to directly determine the potential from an infinite uniform line charge ρlo that is on the z axis.

    When we talk about it in class, I learn that the potential integral was used for finite displacement. I read the textbook but I did not have other information.

    So I there other reason to answer this question? This concept of infinity is a little vague for me.
    B.
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by braddy View Post
    Hi ,
    i have a question I dont know how to answer:

    Explain why the potential integral formula cannot be used to directly determine the potential from an infinite uniform line charge ρlo that is on the z axis.

    When we talk about it in class, I learn that the potential integral was used for finite displacement. I read the textbook but I did not have other information.

    So I there other reason to answer this question? This concept of infinity is a little vague for me.
    B.
    I'll answer by asking a question:
    Where is the reference point (that is, where is the potential function equal to 0) for this problem?

    -Dan
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  3. #3
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    Quote Originally Posted by topsquark View Post
    I'll answer by asking a question:
    Where is the reference point (that is, where is the potential function equal to 0) for this problem?

    -Dan
    The convention says at infinity V=0[V].
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